boot.h revision 1b72691ce35812ff865d778f303779e774d2b098 
1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 *   Copyright (C) 1991, 1992 Linus Torvalds
4 *   Copyright 2007 rPath, Inc. - All Rights Reserved
5 *
6 *   This file is part of the Linux kernel, and is made available under
7 *   the terms of the GNU General Public License version 2.
8 *
9 * ----------------------------------------------------------------------- */
10
11/*
12 * Header file for the real-mode kernel code
13 */
14
15#ifndef BOOT_BOOT_H
16#define BOOT_BOOT_H
17
18#define STACK_SIZE	512	/* Minimum number of bytes for stack */
19
20#ifndef __ASSEMBLY__
21
22#include <stdarg.h>
23#include <linux/types.h>
24#include <linux/edd.h>
25#include <asm/boot.h>
26#include <asm/setup.h>
27#include "bitops.h"
28#include <asm/cpufeature.h>
29
30/* Useful macros */
31#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
32
33#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
34
35extern struct setup_header hdr;
36extern struct boot_params boot_params;
37
38/* Basic port I/O */
39static inline void outb(u8 v, u16 port)
40{
41	asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
42}
43static inline u8 inb(u16 port)
44{
45	u8 v;
46	asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
47	return v;
48}
49
50static inline void outw(u16 v, u16 port)
51{
52	asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
53}
54static inline u16 inw(u16 port)
55{
56	u16 v;
57	asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
58	return v;
59}
60
61static inline void outl(u32 v, u16 port)
62{
63	asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
64}
65static inline u32 inl(u32 port)
66{
67	u32 v;
68	asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
69	return v;
70}
71
72static inline void io_delay(void)
73{
74	const u16 DELAY_PORT = 0x80;
75	asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
76}
77
78/* These functions are used to reference data in other segments. */
79
80static inline u16 ds(void)
81{
82	u16 seg;
83	asm("movw %%ds,%0" : "=rm" (seg));
84	return seg;
85}
86
87static inline void set_fs(u16 seg)
88{
89	asm volatile("movw %0,%%fs" : : "rm" (seg));
90}
91static inline u16 fs(void)
92{
93	u16 seg;
94	asm volatile("movw %%fs,%0" : "=rm" (seg));
95	return seg;
96}
97
98static inline void set_gs(u16 seg)
99{
100	asm volatile("movw %0,%%gs" : : "rm" (seg));
101}
102static inline u16 gs(void)
103{
104	u16 seg;
105	asm volatile("movw %%gs,%0" : "=rm" (seg));
106	return seg;
107}
108
109typedef unsigned int addr_t;
110
111static inline u8 rdfs8(addr_t addr)
112{
113	u8 v;
114	asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
115	return v;
116}
117static inline u16 rdfs16(addr_t addr)
118{
119	u16 v;
120	asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
121	return v;
122}
123static inline u32 rdfs32(addr_t addr)
124{
125	u32 v;
126	asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
127	return v;
128}
129
130static inline void wrfs8(u8 v, addr_t addr)
131{
132	asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
133}
134static inline void wrfs16(u16 v, addr_t addr)
135{
136	asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
137}
138static inline void wrfs32(u32 v, addr_t addr)
139{
140	asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
141}
142
143static inline u8 rdgs8(addr_t addr)
144{
145	u8 v;
146	asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
147	return v;
148}
149static inline u16 rdgs16(addr_t addr)
150{
151	u16 v;
152	asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
153	return v;
154}
155static inline u32 rdgs32(addr_t addr)
156{
157	u32 v;
158	asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
159	return v;
160}
161
162static inline void wrgs8(u8 v, addr_t addr)
163{
164	asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
165}
166static inline void wrgs16(u16 v, addr_t addr)
167{
168	asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
169}
170static inline void wrgs32(u32 v, addr_t addr)
171{
172	asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
173}
174
175/* Note: these only return true/false, not a signed return value! */
176static inline int memcmp(const void *s1, const void *s2, size_t len)
177{
178	u8 diff;
179	asm("repe; cmpsb; setnz %0"
180	    : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
181	return diff;
182}
183
184static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
185{
186	u8 diff;
187	asm volatile("fs; repe; cmpsb; setnz %0"
188		     : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
189	return diff;
190}
191static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
192{
193	u8 diff;
194	asm volatile("gs; repe; cmpsb; setnz %0"
195		     : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
196	return diff;
197}
198
199static inline int isdigit(int ch)
200{
201	return (ch >= '0') && (ch <= '9');
202}
203
204/* Heap -- available for dynamic lists. */
205extern char _end[];
206extern char *HEAP;
207extern char *heap_end;
208#define RESET_HEAP() ((void *)( HEAP = _end ))
209static inline char *__get_heap(size_t s, size_t a, size_t n)
210{
211	char *tmp;
212
213	HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
214	tmp = HEAP;
215	HEAP += s*n;
216	return tmp;
217}
218#define GET_HEAP(type, n) \
219	((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
220
221static inline bool heap_free(size_t n)
222{
223	return (int)(heap_end-HEAP) >= (int)n;
224}
225
226/* copy.S */
227
228void copy_to_fs(addr_t dst, void *src, size_t len);
229void *copy_from_fs(void *dst, addr_t src, size_t len);
230void copy_to_gs(addr_t dst, void *src, size_t len);
231void *copy_from_gs(void *dst, addr_t src, size_t len);
232void *memcpy(void *dst, void *src, size_t len);
233void *memset(void *dst, int c, size_t len);
234
235#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
236#define memset(d,c,l) __builtin_memset(d,c,l)
237
238/* a20.c */
239int enable_a20(void);
240
241/* apm.c */
242int query_apm_bios(void);
243
244/* cmdline.c */
245int cmdline_find_option(const char *option, char *buffer, int bufsize);
246int cmdline_find_option_bool(const char *option);
247
248/* cpu.c, cpucheck.c */
249struct cpu_features {
250	int level;		/* Family, or 64 for x86-64 */
251	int model;
252	u32 flags[NCAPINTS];
253};
254extern struct cpu_features cpu;
255int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
256int validate_cpu(void);
257
258/* edd.c */
259void query_edd(void);
260
261/* header.S */
262void __attribute__((noreturn)) die(void);
263
264/* mca.c */
265int query_mca(void);
266
267/* memory.c */
268int detect_memory(void);
269
270/* pm.c */
271void __attribute__((noreturn)) go_to_protected_mode(void);
272
273/* pmjump.S */
274void __attribute__((noreturn))
275	protected_mode_jump(u32 entrypoint, u32 bootparams);
276
277/* printf.c */
278int sprintf(char *buf, const char *fmt, ...);
279int vsprintf(char *buf, const char *fmt, va_list args);
280int printf(const char *fmt, ...);
281
282/* string.c */
283int strcmp(const char *str1, const char *str2);
284size_t strnlen(const char *s, size_t maxlen);
285unsigned int atou(const char *s);
286
287/* tty.c */
288void puts(const char *);
289void putchar(int);
290int getchar(void);
291void kbd_flush(void);
292int getchar_timeout(void);
293
294/* video.c */
295void set_video(void);
296
297/* video-mode.c */
298int set_mode(u16 mode);
299int mode_defined(u16 mode);
300void probe_cards(int unsafe);
301
302/* video-vesa.c */
303void vesa_store_edid(void);
304
305/* voyager.c */
306int query_voyager(void);
307
308#endif /* __ASSEMBLY__ */
309
310#endif /* BOOT_BOOT_H */
311